code: def test_objectmapper(self):
      df = pdml.ModelFrame([])
      self.assertIs(
          df.isotonic.IsotonicRegression, isotonic.IsotonicRegression
      )
  
file_path: pandas-ml/pandas_ml/skaccessors/test/test_isotonic.py
imports: import numpy
  import sklearn.isotonic
  import pandas_ml
  import pandas_ml.util.testing
label_desc: Use image node_id 1 for calling the TestIsotonic obj's underlying member method code with example usage: obj.test_objectmapper() without return types